The problem with the filibuster thing is that the Dems are slated, by just about every talking head, on either side, to lose next year's election. If that happens, and its close, then the Dems just may want the filibuster in place.
So far, as far as I can tell, I agree that they are going to lose. On the way they are going to stop any of their legislation from passing which will include the basic infrastructure thing that ALL the states are eagerly awaiting so they can fix as much as they can. So, by the time next year's election the Dems got to deal with their big deals whilst they were in charge which will come to a total of NOTHING! (I REALLY hope I am wrong!) Oh, and a president which has demonstrated that he can't admit being wrong about anything and accompanied by a Democratic party that really knows how to run their mouths, to their own detriment, whilst fighting with each other as publicly as they can manage.
The real shame is that the Republicans are also working really hard to piss everybody off and also giving the Dems a chance which they are, as far as I can tell, working equally as hard just proving they are incapable of doing anything for themselves or the nation. the choice will be, basically, vote for somebody who you don't like but just might do something to help the nation or a group that has spent the last year proving they are incapable of doing anything at all. On reflection both sides are so bad that there are going to be a LOT of voters who are just not going to vote at all because the choices are going to be so bad. As far as I can tell the Republicans, especially the senate Republicans have spent the last 5.5 years doing just about nothing and proud of it. So, I guess, on reflection, that neither side is worth a damn.
The only real difference is that the Dems tend to be more concerned with reality and the other side has absolutely no interest in reality.